Itel A13 is android Marsmallow based custom rom for Spreadtrum Sc7731. This rom is very smooth and stable custom for Sc7731/Sc8830 with great performance and battery backup. Itel A13 rom is pretty customized rom and it also stable to use. If you would like to use this rom on other device you need to port the custom rom properly. You may find the custom rom porting tutorial on navigation menu of this website.